Trigger Labor-Saving Structure of Crossbow

ABSTRACT

A trigger labor-saving structure of a crossbow, the crossbow includes a body, an arcuate limb, and a trigger assembly. The limb is mounted adjacent to a front end of the body and intersects with the body, and the limb includes a bowstring. The trigger assembly includes: a trigger seat arranged on the body, a trigger partially accommodated in the trigger seat and downward extending out of the trigger seat, the trigger having a stop face; a string hook member housed in the trigger seat and including an engagement face corresponding to the stop face; and at least one concave portion formed on the engagement face of the string hook member and defined between the first periphery and the second periphery, such that frictional resistance between the stop face and the engagement face reduces.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a crossbow, and more particularly to a trigger labor-saving structure of the crossbow.

Description of the Prior Art

A conventional crossbow contains a body and a limb, wherein the body has a crossbow stock formed on a rear end thereof, a trigger arranged on a front end of the crossbow stock, a connection mount connected on the trigger, and a sight telescope fixed on the connection mount. The limb is in an arc shape and is mounted adjacent to a front end of the body. The limb intersects with the body so that the body and the limb are formed in a cross shape. In operation, a bowstring is pulled backward so as to hook on the trigger, an arrow is placed on the body so as to correspond to the bowstring, and a target is aimed by using the sight telescope. Thereafter, the trigger is pressed so that the bowstring removes from the trigger, and the arrow is pushed to shoot outwardly.

A conventional trigger assembly contains a trigger and a string hook member, the trigger has a stop face defined on an end thereof, and the string hook member has an engagement face formed on an end thereof and corresponding to the stop face. When the bowstring is pulled rearward to be hook by the string hook member, the engagement face of the string hook member is stopped by the stop face of the trigger. While pulling the trigger, the stop face of the trigger removes from the engagement face of the string hook member so that the bowstring removes from the string hook member, and an arrow is pushed by the bowstring to shoot outwardly.

However, the stop face of the trigger and the engagement face of the string hook member are plane so as to produce friction resistance between the stop face and the engagement face greatly, thus pulling the trigger troublesomely as triggering the trigger.

The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a trigger labor-saving structure of a crossbow in which at least one concave portion is formed on a engagement face of a string hook member, and the at least one concave portion is defined between a first periphery and a second periphery of the engagement face, such that frictional resistance between a stop face and the engagement face reduces without influencing structural strength of the string hook member, so as to save operation labor of the trigger, when triggering the crossbow.

To obtain above-mentioned objective, a trigger labor-saving structure of a crossbow provided by the present invention, the crossbow contains: a body, a limb, and a trigger assembly.

The limb is in an arc shape and is mounted adjacent to a front end of the body, and the limb intersects with the body and includes a bowstring fixed on two ends of the limb, wherein the trigger assembly includes:

a trigger seat arranged on the body of the crossbow;

a trigger partially accommodated in the trigger seat and downward extending out of the trigger seat so as to control triggering of the crossbow, the trigger having a stop face defined on an end of the trigger inside the trigger seat;

a string hook member housed in the trigger seat so as to hook the bowstring of the crossbow after the bowstring being pulled rearward, and the string hook member including an engagement face formed on an end of the string hook member corresponding to the stop face of the trigger, the engagement face having a first periphery and a second periphery opposite to the first periphery; and

at least one concave portion being formed on the engagement face of the string hook member and defined between the first periphery and the second periphery of the engagement face, such that frictional resistance between the stop face and the engagement face reduces without influencing structural strength of the string hook member.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing the assembly of a trigger labor-saving structure of a crossbow according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the assembly of a trigger assembly of the trigger labor-saving structure of the crossbow according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing the exploded components of the trigger assembly of the trigger labor-saving structure of the crossbow according to the first embodiment of the present invention.

FIG. 4 is a cross sectional view taken along the line A-A of FIG. 2.

FIG. 4A is an amplified cross sectional view of a portion circled by a dotted line of FIG. 4.

FIG. 5 is a cross sectional view taken along the line B-B of FIG. 2.

FIG. 6 is a cross sectional view showing the operation of the trigger labor-saving structure of the crossbow according to the first embodiment of the present invention.

FIG. 7 is a perspective view showing the exploded components of a trigger assembly of a trigger labor-saving structure of a crossbow according to a second embodiment of the present invention.

FIG. 8 is a cross sectional view showing the assembly of the trigger assembly of the trigger labor-saving structure of the crossbow according to the second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, a preferred embodiment in accordance with the present invention.

With reference to FIGS. 1-5, a trigger labor-saving structure of a crossbow in accordance with a first embodiment of the present invention, the crossbow A1 includes a body A11, a limb A12, and a trigger assembly A13, wherein the limb A12 is in an arc shape and is mounted adjacent to a front end of the body A11, and the limb A12 intersects with the body A11 so that the body A11 and the limb A12 are formed in a cross shape, and the limb A12 includes a bowstring A14 fixed on two ends thereof. The trigger assembly A13 includes a trigger seat 10, a trigger 20, a string hook member 30, and at least one concave portion 40.

The trigger seat 10 is arranged on the body A11 of the crossbow A1.

The trigger 20 is partially accommodated in the trigger seat 10 and downward extending out of the trigger seat 10 so as to control triggering of the crossbow A1. The trigger 20 has a stop face 21 defined on an end thereof inside the trigger seat 10.

The string hook member 30 is housed in the trigger seat 10 so as to hook the bowstring A14 of the crossbow A1 after the bowstring A14 being pulled rearward. The string hook member 30 includes an engagement face 31 formed on an end thereof corresponding to the stop face 21 of the trigger 20, and the engagement face 31 having a first periphery 311 and a second periphery 312 opposite to the first periphery 311.

In this embodiment, a concave portion 40 is arcuate and is formed on the engagement face 31 of the string hook member 30, and the concave portion 40 is defined between the first periphery 311 and the second periphery 312 of the engagement face 31.

As shown in FIG. 6, when triggering the crossbow, the bowstring A14 is pulled rearward so as to be hooked on the string hook member 30, in the meantime, the engagement face 31 of the string hook member 30 is stopped by the stop face 21 of the trigger 20, when triggering the crossbow by using the trigger 20, the stop face 21 of the trigger 20 removes from the engagement face 31 of the string hook member 30 so that the bowstring A14 removes from the string hook member 30, and an arrow is pushed by the bowstring A14 to shoot outwardly.

Referring to FIGS. 7 and 8, a difference of a trigger labor-saving structure of a crossbow from that of the first embodiment comprises: the trigger assembly A13 having two concave portions 40 which are defined on the engagement face 31 of the string hook member 30 and between the first periphery 311 and the second periphery 312 of the engagement face 31.

Thereby, the trigger labor-saving structure of the present invention has advantages as follows:

the at least one concave portion 40 is formed on the engagement face 31 of the string hook member 30, and the concave portion 40 is defined between the first periphery 311 and the second periphery 312 of the engagement face 31, such that frictional resistance between the stop face 21 and the engagement face 31 reduces without influencing structural strength of the string hook member 30, so as to save operation labor of the trigger 20, when triggering the crossbow.

While various embodiments in accordance with the present invention have been shown and described, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention. 

What is claimed is:
 1. A trigger labor-saving structure of a crossbow, the crossbow including: a body, a limb, and a trigger assembly, the limb being in an arc shape and being mounted adjacent to a front end of the body, and the limb intersecting with the body and including a bowstring fixed on two ends of the limb, wherein the trigger assembly includes: a trigger seat arranged on the body of the crossbow; a trigger partially accommodated in the trigger seat and downward extending out of the trigger seat so as to control triggering of the crossbow, the trigger having a stop face defined on an end of the trigger inside the trigger seat a string hook member housed in the trigger seat so as to hook the bowstring of the crossbow after the bowstring being pulled rearward, and the string hook member including an engagement face formed on an end of the string hook member corresponding to the stop face of the trigger, and the engagement face having a first periphery and a second periphery opposite to the first periphery; and at least one concave portion being formed on the engagement face of the string hook member and defined between the first periphery and the second periphery of the engagement face, such that frictional resistance between the stop face and the engagement face reduces without influencing structural strength of the string hook member.
 2. The trigger labor-saving structure as claimed in claim 1, wherein the at least one concave portion is arcuate. 